Tender Offer and Warrants and Stock Repurchases - Warrant Activity (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Jul. 01, 2013
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		21,605
Exercised (in shares)		(73)
Repurchased (in shares)	(2,600)	(15,350)
Warrants - Outstanding at end of period (in shares)	21,605	6,182
Class A
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)		$ 11.70	$ 12.00
Initial term (years)		4 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		7,097
Exercised (in shares)		(55)
Repurchased (in shares)		(5,016)
Warrants - Outstanding at end of period (in shares)	7,097	2,026
Class B
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)		$ 13.16	13.50
Initial term (years)		5 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		7,254
Exercised (in shares)		(18)
Repurchased (in shares)		(5,167)
Warrants - Outstanding at end of period (in shares)	7,254	2,069
Class C
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)		$ 14.63	$ 15.00
Initial term (years)		6 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		7,254
Exercised (in shares)		0
Repurchased (in shares)		(5,167)
Warrants - Outstanding at end of period (in shares)	7,254	2,087